You Can Now Build Muscle Without Exercising, New Research Finds

Creatine’s a familiar supplement in the fitness world, closely associated with lifting weights, building strength and getting more from a workout. But new research suggests its effects may extend beyond the gym.

In a 12-week study of healthy adults aged 45–65, people taking creatine gained lean tissue and improved measures of strength even without following a structured exercise programme.¹

The effect was also seen alongside exercise. Participants taking creatine while following a structured workout programme and calorie-reduced diet increased lean tissue, lost body fat and saw greater improvements in measures of muscular strength and endurance.¹

So why might a supplement best known for supporting exercise have an effect when you're not exercising? And what could that tell us about the way we maintain muscle as we age?

What did the researchers actually do?

To investigate whether creatine's effects depended on exercise, researchers recruited 73 healthy, sedentary adults aged 45–65. Sixty-four participants completed the full 12-week study.¹

Participants chose whether to join a structured exercise and calorie-reduced diet programme or continue without a structured exercise programme or prescribed diet. Within each group, participants were randomly assigned to take either creatine monohydrate or a placebo.¹

The creatine groups took 10g a day, split into two 5g doses.¹

Over the 12 weeks, researchers tracked changes in body composition, strength and muscular endurance, alongside a range of cognitive and health markers. Body composition was measured using DXA scans, which distinguish between fat mass, lean mass and bone mineral content.¹

This allowed the researchers to ask a fairly simple question: does creatine still make a difference when you take exercise out of the equation?

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So, what happened?

The most interesting result came from the group taking creatine without a structured exercise programme.

After 12 weeks, they had gained around 1.1kg of lean tissue on average, while also improving on a measure of strength. The placebo group following the same non-exercise programme did not see the same increase in lean tissue.¹

That’s important because creatine’s usually discussed in the context of exercise. Its best-established role is helping the body rapidly regenerate ATP, the energy currency cells use to power muscle contractions. That can help support performance during repeated, high-intensity activity, while research also suggests potential benefits for recovery and training adaptations.²

(Photo from iStock of a man taking creatine pre-workout) 

But creatine’s stored in muscle as phosphocreatine and plays a role in cellular energy availability beyond individual workouts. The study did not establish why lean tissue increased without structured exercise, so the mechanism behind the finding remains uncertain.

There’s an important distinction, though: the study measured lean tissue mass, rather than directly measuring new muscle fibers. DXA-derived lean tissue is not the same as skeletal muscle and may also reflect changes in body water.³

So the results suggest an increase in lean mass, alongside improvements in strength, rather than proving that 1.1kg of new muscle was built.

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What happened when structured exercise was added?

The exercise group showed a similar increase in lean tissue, with participants taking creatine alongside exercise and a calorie-reduced diet gaining around 1.27kg of lean tissue over 12 weeks. They also reduced body fat and improved measures of muscular strength and endurance.¹

The creatine group saw a greater reduction in body-fat percentage than the corresponding placebo group, suggesting that creatine may have added something to the effects of the exercise and diet programme.¹

That fits with what we already know about creatine: its strongest evidence base is in combination with resistance training, where it can help support training performance and adaptations over time.²

What’s more interesting is the study found changes in lean tissue even in participants who weren't following a structured exercise programme.¹

The researchers say this raises questions about whether creatine could have a role in supporting muscle and physical function during midlife and beyond. That's particularly interesting because muscle mass and strength naturally decline with age, making muscle preservation increasingly important for maintaining physical function and independence later in life.⁴

It's worth noting... 

The study is too small and short to say whether creatine translates into meaningful long-term benefits. Participants also chose whether to join the exercise programme, rather than being randomly assigned to exercise or no exercise, and only 13 people completed each non-exercise arm. But it adds to the case for investigating how creatine might support muscle health as we age.¹

The study received funding through an unrestricted gift from the WoodNext Foundation. Alzchem, a creatine manufacturer, supplied the supplements and funded some laboratory testing; the lead author is chair of Alzchem’s scientific advisory board. The authors state that the sponsors were not involved in collecting, analysing or interpreting the data.¹

The findings don't mean you can replace exercise with creatine. They add another dimension to supplementation and raise an interesting question about whether its role could extend beyond helping someone perform better during exercise to supporting lean tissue and strength over time.

Larger and longer studies will be needed to understand exactly what’s driving these changes and whether they translate into meaningful long-term improvements in muscle health.

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References

1. Chun, J. et al. Effects of creatine supplementation with and without exercise and diet intervention on body composition, cognitive function, and markers of health in middle-aged and older adults. J. Int. Soc. Sports Nutr. 23, 2716273 (2026).

2. Wax, B., Kerksick, C. M., Jagim, A. R., Mayo, J. J., Lyons, B. C. & Kreider, R. B. Creatine for exercise and sports performance, with recovery considerations for healthy populations. Nutrients 13, 1915 (2021).

3. Brooks, S. J. et al. Creatine monohydrate supplementation changes total body water and DXA lean mass estimates in female collegiate dancers. J. Int. Soc. Sports Nutr. 20, 2193556 (2023).

4. Walston, J. D. Sarcopenia in older adults. Curr. Opin. Rheumatol. 24, 623–627 (2012).

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